| NSNational Sintered Alloys Incorporated | Clinton | CT | — | ◇ UNVERIFIED |
| NSNational Sintered Alloys Incorporated | Clinton | CT | — | ◇ UNVERIFIED |
| NINatures Image INC | Lake Forest | CA | — | ◇ UNVERIFIED |
| NHNb Handy | Lynchburg | VA | — | ◇ UNVERIFIED |
| NDN.c. Dac - Correction Enterprises (franklin) Sign Plant | Bunn | NC | — | ◇ UNVERIFIED |
| NCNch Corporation | Lancaster | TX | — | ◇ UNVERIFIED |
| NMNc Manufacturing | Crestview | FL | — | ◇ UNVERIFIED |
| NCNeapco Components | Beatrice | NE | — | ◇ UNVERIFIED |
| NINelco, INC. | Los Angeles | CA | — | ◇ UNVERIFIED |
| NANelson Avenue | Concord | CA | — | ◇ UNVERIFIED |
| NGNelson Global Products | Greenwood | IN | — | ◇ UNVERIFIED |
| NWNelson Williams Linings INC | Mountain Iron | MN | — | ◇ UNVERIFIED |
| NFNeo Fab LLC / Neo Fab Metal Fabrication Facility | Miami | OK | — | ◇ UNVERIFIED |
| NBNew Business Systems, Inc. | Amityville | NY | — | ◇ UNVERIFIED |
| NDNew Deal Metal Buildings, LLC | Denham Springs | LA | — | ◇ UNVERIFIED |
| NENew England Awards and Trophies | Woodstock | CT | — | ◇ UNVERIFIED |
| NENew England Wirecloth Company, INC. | Fitchburg | MA | — | ◇ UNVERIFIED |
| NFNewport Fabricators INC | Green Lane | PA | — | ◇ UNVERIFIED |
| NCNexGen Composites, LLC | Franklin | OH | — | ◇ UNVERIFIED |
| NINext Innovations LTD | Walker | MN | — | ◇ UNVERIFIED |
| NIN-fab, INC. | Houston | TX | — | ◇ UNVERIFIED |
| NINGU Industries L.L.C. | Concord | NC | — | ◇ UNVERIFIED |
| NMNicholas Malkoch | Clayton | NC | — | ◇ UNVERIFIED |
| NPNickelson Plastics INC | Osceola | WI | — | ◇ UNVERIFIED |
| NINicks Iron Works, INC | Brooklyn | NY | — | ◇ UNVERIFIED |
| NMNick's Metal Fabricating & Sons, Inc. | Seneca | IL | — | ◇ UNVERIFIED |
| NBNifty Bar Grinding & Cutting Solutions, Inc. | Penfield | NY | — | ◇ UNVERIFIED |
| NINikkel Iron Works INC | Shafter | CA | — | ◇ UNVERIFIED |
| NBNiles Building Products INC. | Niles | OH | — | ◇ UNVERIFIED |
| NLNineThree010, LLC | Logan | UT | — | ◇ UNVERIFIED |
| NMNiron Magnetics INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| NMNiron Magnetics-sartell | Sartell | MN | — | ◇ UNVERIFIED |
| NINmi Industrial Holdings INC | Sacramento | CA | — | ◇ UNVERIFIED |
| NNNobelclad New Stockpile | Dunbar | PA | — | ◇ UNVERIFIED |
| NWNoble Welding & Mfg INC | Centerville | MN | — | ◇ UNVERIFIED |
| NBNor Bay Ironcraft | Petaluma | CA | — | ◇ UNVERIFIED |
| NINorcold INC * | Gettysburg | OH | — | ◇ UNVERIFIED |
| NANordson Asymtek | Vista | CA | — | ◇ UNVERIFIED |
| NFNorell Foundry & Machine INC | Franklin | NH | — | ◇ UNVERIFIED |
| NINorfolk Iron and Metal | New Century | KS | — | ◇ UNVERIFIED |
| NANorth American Lighting | Farmington Hills | MI | — | ◇ UNVERIFIED |
| NANorth American Lighting Assembly Plant | Salem | IL | — | ◇ UNVERIFIED |
| NANorth American Waste Management Usa, LLC | Saco | ME | — | ◇ UNVERIFIED |
| NMNorthbridge Mills LLC | Northbridge | MA | — | ◇ UNVERIFIED |
| NCNorth County Iron Corp. | Groveton | NH | — | ◇ UNVERIFIED |
| NCNortheast Construction Industries, INC. | Montgomery | NY | — | ◇ UNVERIFIED |
| NENorth East Fabrication Company INC | Jonesville | MI | — | ◇ UNVERIFIED |
| NFNortheast Fence & Iron Works, INC. | Philadelphia | PA | — | ◇ UNVERIFIED |
| NCNorthern Containment LLC | Brainerd | MN | — | ◇ UNVERIFIED |
| NPNorthern Plains Steel CO | Fargo | ND | — | ◇ UNVERIFIED |
| NSNorthern Steel Manufacturing LLC | Elcho | WI | — | ◇ UNVERIFIED |
| NHNorth Houston Machine, INC. | Tomball | TX | — | ◇ UNVERIFIED |
| NMNorth Marina Bayside Abw Site | Everett | WA | — | ◇ UNVERIFIED |
| NSNorth Silsbee Facility | Silsbee | TX | — | ◇ UNVERIFIED |
| NSNorth Star Cart Company | Brooklyn Center | MN | — | ◇ UNVERIFIED |
| NSNorth Star Propellers INC | San Diego | CA | — | ◇ UNVERIFIED |
| NSNorth Star Safe LLC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| NINorthwest Industries, INC. | Russellville | AL | — | ◇ UNVERIFIED |
| NPNorthwest Precision Fabricators INC | Oregon City | OR | — | ◇ UNVERIFIED |
| NMNorwest Manufacturing Equipment LLC | Rupert | ID | — | ◇ UNVERIFIED |
| NANose and Mustache LLC | Markle | IN | — | ◇ UNVERIFIED |
| NINova Industries INC | San Leandro | CA | — | ◇ UNVERIFIED |
| NSNova Services INC. | Toledo | OH | — | ◇ UNVERIFIED |
| NFNowlin Fence INC | Anaheim | CA | — | ◇ UNVERIFIED |
| NBNSG Browns, LLC | Topeka | KS | — | ◇ UNVERIFIED |
| NLNsjs LLC | Dallas | TX | — | ◇ UNVERIFIED |
| NFNuair Filter CO LLC | Normal | IL | — | ◇ UNVERIFIED |
| NLNucfil, LLC | Golden | CO | — | ◇ UNVERIFIED |
| NGNucor Grating - Fisher & Ludlow INC. | Madison | MS | — | ◇ UNVERIFIED |
| NRNucor Rebar Fabrication Fontana | Fontana | CA | — | ◇ UNVERIFIED |
| NRNucor Rebar Fabrication Southwest INC | Lakeside | CA | — | ◇ UNVERIFIED |
| NTNutec Tooling Sys | Meadville | PA | — | ◇ UNVERIFIED |
| NFNW Fluid Power & Controls Co. LLC | Auburn | WA | — | ◇ UNVERIFIED |
| NINw Iron Works INC | Portland | OR | — | ◇ UNVERIFIED |
| NMNymar Manufacturing Co., INC. | Randolph | NJ | — | ◇ UNVERIFIED |
| OBO.a. Both CORP Dba Schlenk Metalic Pigments (stormwater) | Lawrence | KS | — | ◇ UNVERIFIED |
| OROak Ridge Loans INC | Oak Ridge | TN | — | ◇ UNVERIFIED |
| OAOakwalk Apartments | Emeryville | CA | — | ◇ UNVERIFIED |
| OBO B I Linings | Chocowinity | NC | — | ◇ UNVERIFIED |
| OLObi Linings INC | Chocowinity | NC | — | ◇ UNVERIFIED |
| OMO'Brien Metal Inc. | Chicago | IL | — | ◇ UNVERIFIED |
| OOObrien Ornamental Iron INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| OEOceanside Engineering Mfg | Oceanside | CA | — | ◇ UNVERIFIED |
| OCOctober CO Chemetal Division | Easthampton | MA | — | ◇ UNVERIFIED |
| OEOec Engineering Corporation | Chantilly | VA | — | ◇ UNVERIFIED |
| OFOem Fabricators INC | Baldwin | WI | — | ◇ UNVERIFIED |
| OAOffroad Addiction, Inc | Oklahoma City | OK | — | ◇ UNVERIFIED |
| OSOffshore Spars Co. | Chesterfield | MI | — | ◇ UNVERIFIED |
| OMOgden Module Facility | Ogden | UT | — | ◇ UNVERIFIED |
| OMOhio Match CO | Mancos | CO | — | ◇ UNVERIFIED |
| OMOhio Metal Technologies INC | Hebron | OH | — | ◇ UNVERIFIED |
| OKOh Keys | Bethany | OK | — | ◇ UNVERIFIED |
| OPOh & Payne Intl. LLC. | Norcross | GA | — | ◇ UNVERIFIED |
| OSOklahoma Stair Craft, INC. | Sapulpa | OK | — | ◇ UNVERIFIED |
| OOldcastle | Egg Harbor City | NJ | — | ◇ UNVERIFIED |
| OSOld Sole Fabrication INC | Denver | CO | — | ◇ UNVERIFIED |
| OSOld South Fabricators L.l.c. | Lecompte | LA | — | ◇ UNVERIFIED |
| OSOld South Ironworks INC | Gray | TN | — | ◇ UNVERIFIED |
| OWOld World Iron | Gilroy | CA | — | ◇ UNVERIFIED |
| OOOliver's Ornamental Iron, LLC | Flora | MS | — | ◇ UNVERIFIED |
